CN114313836A - Discontinuous blade screw conveyer and use its batching scale - Google Patents

Abstract

The invention discloses an interrupted blade screw conveyor and a batching scale using the same, wherein the intermittent blade screw conveyor comprises a shell, a screw rod positioned in the shell and a driving motor for driving the screw rod to rotate, and a feed inlet and a discharge outlet are formed in the shell; the periphery of the screw is provided with a transmission blade, the transmission blade comprises a continuous helical blade and an intermittent helical blade, the intermittent helical blade is formed by spirally arranging a plurality of short blades arranged at intervals, and the intermittent helical blade is positioned in front of the discharge hole. In the invention, at the position close to the discharge hole, the original continuous helical blade is replaced by the discontinuous helical blade; in the process of spiral slow feeding, the feeding amount of the conveyor is changed into a small block, and the rear materials are blocked by the intermittent spiral blades, so that the feeding precision of the spiral is greatly improved.

Description

Discontinuous blade screw conveyer and use its batching scale

Technical Field

The invention relates to the technical field of powder conveying, in particular to an intermittent blade screw conveyer and a batching scale using the same.

Background

The batching scale is widely applied to various fields of chemical industry, plastics, medicine and the like, and is suitable for accurately metering and feeding various materials such as granular materials, fiber materials, powder materials, sheet materials, liquid and the like.

The batching scale mainly comprises two parts: the material mechanical part (scale body, screw conveyer), the electric control part (including weight signal acquisition, processing, control).

The screw conveyor is a device for conveying materials by pushing the materials through rotation of the screw shaft, is suitable for conveying powder, and is widely applied to industries such as metallurgy, chemical engineering, building materials, food and the like.

The working principle is as follows: the motor speed reducer drives the shaft with the helical blade to rotate in the fixed groove, so that the entering material does not rotate together with the helix due to the gravity of the material and the friction force on the shell, and only moves along the material groove, and the purpose of conveying the material is achieved.

The continuous helical blade that present screw conveyer all used, in the batching process, especially last process of feeding slowly, the discharge gate position is because also continuous blade, once a pitch's blade anterior segment surpasss the discharge gate, all materials of this pitch just fall down very probably, and the precision is difficult to control.

With the continuous improvement of the batching precision requirement of an owner, the batching precision requirement is improved from 2 per mill at the beginning to 1 per mill afterwards, and the high precision requirement of 0.5 per mill even appears at present, so that the existing common batching scale cannot meet the precision requirement.

Therefore, a batching scale with higher precision needs to be designed, and the problem of batching precision is perfectly solved on the basis of meeting the production capacity of a process line.

Disclosure of Invention

In order to solve the technical problems that continuous spiral blades are used in conveyors in the prior art, the material quantity of one pitch can fall at a discharge port at one time, and the precision is difficult to control, the invention provides an intermittent blade spiral conveyor and a batching scale using the intermittent blade spiral conveyor to solve the problems.

The invention provides an interrupted blade screw conveyor, which comprises a shell, a screw rod and a driving motor, wherein the screw rod is positioned in the shell, the driving motor drives the screw rod to rotate, and a feeding hole and a discharging hole are formed in the shell; the periphery of the screw is provided with a transmission blade, the transmission blade comprises a continuous helical blade and an intermittent helical blade, the intermittent helical blade is formed by spirally arranging a plurality of short blades arranged at intervals, and the intermittent helical blade is positioned in front of the discharge hole.

Furthermore, one axial end of the screw rod is suspended.

Furthermore, the discharge hole is positioned at one end, close to the suspended end of the screw, of the shell.

Further, the pitch of the continuous helical blade close to the discharge hole is gradually increased.

Further, still include with the thick screw conveyer that the casing is connected, thick screw conveyer's entry is connected with higher level equipment, and thick screw conveyer with the feed inlet is connected.

Further, the coarse screw conveyor is connected with the feed inlet through an intermediate connecting pipe, and an outlet of the coarse screw conveyor is connected with the discharge outlet.

Further, the intermediate connecting pipe is located right below the inlet of the coarse screw conveyor.

The invention also provides a batching scale, which comprises a storage bin, a weighing device and the intermittent blade screw conveyor, wherein the weighing device is suitable for measuring the weight of the materials in the storage bin, and the intermittent blade screw conveyor is connected with the discharge opening of the storage bin.

Furthermore, the weighing device is a digital weighing sensor arranged outside the silo, and the digital weighing sensor and the discontinuous blade screw conveyor are electrically connected with the PLC.

Furthermore, an arch breaking device is further arranged between the discharge opening and the intermittent blade screw conveyor, the arch breaking device comprises a cone hopper, an arch breaking paddle and a driving mechanism for driving the arch breaking paddle to rotate, the axial two ends of the cone hopper are respectively connected with the discharge opening and the intermittent blade screw conveyor, the arch breaking paddle is arranged along the horizontal direction, and a plurality of blades which extend in the radial direction and are staggered in the axial direction are arranged on the arch breaking paddle.

Further, the inside decompression awl that still is equipped with of feed bin, the bottom of decompression awl is equipped with the mounting flange of can dismantling the connection with the discharge opening.

The invention has the beneficial effects that:

(1) the invention relates to an intermittent blade screw conveyor and a batching scale using the same.A discontinuous screw blade is used for replacing an original continuous screw blade at a position close to a discharge hole; the distance of one pitch is originally welded on the screw by a plurality of discontinuous blades, the material is divided into a plurality of small blocks by one large block in the discontinuous helical blade with the same pitch, the blanking amount of the conveyor is changed into a small block in the slow feeding process of the screw, and the following material is blocked by the discontinuous helical blade, so that the feeding precision of the screw is greatly improved.

(2) According to the discontinuous blade screw conveyor and the batching scale using the same, the discharge port can be positioned at one axial end of the shell, so that the conveyor is in a cantilever structure, a bearing and a filler sealing structural part can be reduced at the discharge port end, the cost is reduced, and a material leakage point is reduced; meanwhile, the screw rod can be directly taken out from the driving end of the motor for cleaning, and the operation steps are simpler and more convenient.

(3) According to the discontinuous blade screw conveyor and the batching scale using the same, the arch breaking device is arranged at the bottom of the storage bin, so that material blockage at the discharge port is avoided, a stirring structure in the storage bin can be omitted, and the space in the storage bin is saved.

Drawings

The invention is further illustrated with reference to the following figures and examples.

FIG. 1 is a front view of an embodiment of an interrupted blade screw conveyor according to the present invention;

FIG. 2 is an enlarged view taken at a in FIG. 1;

FIG. 3 is a front view of a dispensing scale according to the present invention;

FIG. 4 is a schematic view of the arch breaking apparatus of FIG. 3;

FIG. 5 is a top view of the pressure relief cone of the present invention.

In the figure, 1, a shell, 2, a screw, 3, a driving motor, 4, a feeding port, 5, a discharging port, 6, a continuous spiral blade, 7, a short blade, 8, a coarse spiral conveyer, 9, an intermediate connecting pipe, 10, a storage bin, 11, a weighing device, 12, an intermittent spiral conveyer, 13, a discharging port, 14, a mounting flange, 15, an air hammer, 16, an arch breaking device, 1601, a cone hopper, 1602, an arch breaking paddle, 16021, a paddle, 1603, a driving mechanism, 17, a decompression cone, 1701, a through hole, 18, a supporting plate, 19, a feeding port, 20 and a dust remover.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

Example one

As shown in fig. 1 and fig. 2, an interrupted blade screw conveyor comprises a housing 1, a screw 2 located in the housing 1, and a driving motor 3 for driving the screw 2 to rotate, wherein the housing 1 is provided with a feed port 4 and a discharge port 5, when the screw 2 rotates, a material entering the housing 1 from the feed port 4 is conveyed towards the discharge port 5, and finally falls and is discharged at the discharge port 5 by means of gravity; the periphery of the screw rod 2 is provided with a transmission blade, the transmission blade comprises a continuous helical blade 6 and an intermittent helical blade, the intermittent helical blade is formed by spirally arranging a plurality of short blades 7 which are arranged at intervals, and the intermittent helical blade is positioned in front of the discharge hole 5.

The front of the discharge port 5 is the direction pointing to the feed port 4 along the axial direction of the screw rod 2, as shown in fig. 2, three short blades 7 arranged at intervals are welded on the screw rod 2 in front of the discharge port 5, the three short blades 7 are screwed into a pitch, when materials are conveyed to the intermittent spiral blades, the three short blades 7 divide the materials into three parts, the amount of the materials falling at one time is reduced to one third pitch from the original one pitch, and the materials at the back are blocked by the intermittent spiral blades, so that the feeding precision of the screw is greatly improved. The number of short blades 7 in one pitch can be modified accordingly according to the accuracy requirements.

The continuous helical blade 6 in front of the discharge port 5 is only required to be improved into the discontinuous helical blade, so that the helical feeding precision can be greatly improved, the change on the basis of the original conveyor is small, and the manufacturing process is simple.

Three short blade 7 is the blade of taking helical shape, and a pitch can be constituteed to three short blade 7, and during arranging, the front end of back short blade 7 is located the below of the short blade 7 rear end of previous, is equivalent to a little distance of short blade 7 direction antedisplacement forward, avoids the material to leak to short blade 7's back from the gap between two short blades 7.

In this embodiment, the screw rod 2 can be connected with the casing 1 at both ends, and both ends of the casing 1 need to be provided with a bearing and a sealing structure.

Example two

The screw rod 2 in the embodiment adopts a cantilever type design, namely, the connection between the screw rod 2 and the shell 1 is changed into one end which is rotationally connected, the other end is suspended, one end which is rotationally connected with the shell 1 is connected with the driving motor 3, the screw rod 2 can be used for conveying a small amount of materials, and the pressure on the screw rod 2 is smaller. Casing 1 in this embodiment can integrative closed preparation at the free end of screw rod 2, only needs the one end installation bearing and the seal structure of installation driving motor 3 on casing 1, when demolising screw rod 2, from driving motor 3 one end directly take out screw rod 2 can, the operating procedure is more simple and convenient. The cost is reduced and a material leakage point is reduced.

Preferably, the discharge port 5 is located at an end of the housing 1 near a free end of the screw 2, and the intermittent helical blade is located at an end of the screw 2 facing the discharge port 5. After being conveyed to the tail end of the screw 2, the materials can be directly discharged from the discharge port 5 under the action of gravity.

Preferably, the pitch of the continuous helical blade 6 close to the discharge port 5 is gradually increased, as shown in fig. 1, the pitch of the right end of the continuous helical blade 6 is smaller than that of the left end, so that the conveying speed of the material is reduced when the material is close to the discontinuous helical blade, and the material is prevented from being blocked at the discontinuous helical blade.

EXAMPLE III

In the embodiment, a coarse screw conveyor 8 is added on the basis of the above embodiment, an inlet of the coarse screw conveyor 8 is connected with the upper-level equipment, and the coarse screw conveyor 8 is connected with the feed port 4. The coarse screw conveyor 8 is a screw conveyor in the prior art and can be purchased in the market, the coarse screw conveyor 8 and a lower screw conveyor form primary and secondary screw conveying, wherein the screw pitch of the coarse screw conveyor 8 is large, the blanking amount is also large, the screw pitch of the continuous screw blade 6 in the lower screw conveyor is small, two conveyors are respectively provided with a driving machine, the two conveyors are simultaneously started at the initial stage of feeding, when the batching amount is close to a target value, the conveying of the coarse screw conveyor 8 is stopped, and only the driving motor 3 in the lower screw conveyor is started to achieve the purpose of accurate feeding.

In this embodiment, the outlet and the discharge port 5 of the coarse screw conveyor 8 can be separately arranged, and at this time, two inlets need to be arranged in the lower-level equipment to be respectively connected with the outlet and the discharge port 5 of the coarse screw conveyor 8, so that a certain material leakage risk exists.

Example four

In the embodiment, the outlet of the coarse screw conveyor 8 in the third embodiment is connected with the discharge port 5, so that the coarse screw conveyor can be connected with lower-level equipment through the same outlet, and the risk of material leakage is reduced. The middle part of the coarse screw conveyer 8 is connected with the feed inlet 4 through the middle connecting pipe 9, the materials entering the coarse screw conveyer 8 fall into the shell 1 through the feed inlet 4 in the conveying process, after the coarse screw conveyer 8 stops conveying, the materials accumulated in the shell 1 in advance are continuously conveyed towards the discharge port 5, and at the moment, the materials are precisely conveyed until the target value of the dosage is reached.

Preferably, the intermediate connecting pipe 9 is located directly below the inlet of the coarse screw conveyor 8.

When discharge gate 5 was located the one end of screw rod 2, the end of screw rod 2 was located the place ahead of discharge gate 5 to leave partial cavity region in casing 1 at screw rod 2 rear, thick screw conveyer 8's export is just right to this cavity region, and the material in thick screw conveyer 8 can directly fall through this cavity region, can not contact with screw rod 2, thereby avoids screw rod 2 to receive the impact of a large amount of materials in thick screw conveyer 8.

EXAMPLE five

A batching scale, as shown in fig. 3-5, comprises a silo 10, a weighing device 11 and an intermittent blade screw conveyor 12 as described above, the weighing device 11 being adapted to measure the weight of the material in the silo 10, the intermittent blade screw conveyor 12 being connected to a discharge opening 13 of the silo 10. The top of feed bin 10 sets up pan feeding mouth 19, and the bottom sets up discharge opening 13, and the upper portion of feed bin 10 is the cylinder for installation weighing device 11, and the lower part of feed bin 10 is for the funnel shaped structure that from top to bottom diameter reduces gradually, and the guide material is to the motion of discharge opening 13 direction.

The top of feed bin 10 can set up dust remover 20 for clearance feed bin 10, and the lower part outside of feed bin 10 can set up pneumatic hammer 15 for strike feed bin 10 surface, avoid the material to attach to feed bin 10 inner wall.

The weighing device 11 is preferably a digital weighing sensor installed outside the stock bin 10, the digital weighing sensor and the intermittent blade screw conveyor 12 are electrically connected with the PLC, and the weight of the material in the stock bin 10 is fed back to the PLC in real time through the weighing device 11 installed on the stock bin 10. The intermittent vane screw conveyor 12 starts the batching process (generally divided into fast and slow batching) in different stages according to the weight signal set by the program so as to meet the batching productivity and accurate batching feeding requirements, and after the PLC receives the batching starting signal, the intermittent vane screw conveyor 12 starts to operate, and at this moment, the fast batching stage is achieved. When the PLC receives a signal of starting slow feeding, the coarse screw conveyor 8 stops running, and the driving motor 3 continues feeding till the end of the batching.

EXAMPLE six

On the basis of the fifth embodiment, an arch breaking device 16 is further arranged between the discharge opening 13 and the intermittent vane screw conveyor 12, as shown in fig. 4, the arch breaking device 16 includes a cone hopper 1601, an arch breaking paddle 1602 and a driving mechanism 1603 for driving the arch breaking paddle 1602 to rotate, two axial ends of the cone hopper 1601 are respectively connected with the discharge opening 13 and the intermittent vane screw conveyor 12, the arch breaking paddle 1602 is arranged along the horizontal direction, and the arch breaking paddle 1602 is provided with a plurality of paddles 16021 which extend radially and are arranged in a staggered manner along the axial direction.

Discontinuous blade screw conveyer 12 in this embodiment is primary and secondary spiral, actuating mechanism 1603 can be gear motor, the upper end bore of awl fill 1601 is great, the lower extreme bore is less, the both ends that the awl was fought 1601 set up the flange, be used for fixed with discharge opening 13 and coarse screw conveyer 8's entry, paddle 16021 can be used for the straight-bar, also can be sheet structure, broken hunch oar 1602 passes awl fill 1601 along the horizontal direction, and rotate with awl fill 1601 through the bearing and be connected, through broken hunch oar 1602 at the uniform velocity rotatory, make the material can not take in narrow and small awl fill 1601 and encircle, can smoothly flow in the downstream equipment.

This embodiment need not set up the stirring structure in that feed bin 10 is inside, and the space in feed bin 10 is available whole to be used for holding the material to conveying efficiency has been improved.

EXAMPLE seven

On the basis of the fifth embodiment or the sixth embodiment, a pressure reducing cone 17 is further arranged inside the storage bin 10, and a mounting flange 14 detachably connected with the discharge opening 13 is arranged at the bottom of the pressure reducing cone 17.

Decompression awl 17 is for the centrum of diameter crescent from top to bottom, and the top of decompression awl 17 is sealed, and its circumference side has the through-hole 1701 that supplies the material to pass, also has the clearance simultaneously between decompression awl 17 and the storehouse body, avoids the material to pile up, and decompression awl 17 is installed in discharge opening 13 department, and to heavier material, the perpendicular whereabouts of material can cause the harm to subordinate's equipment, consequently need use decompression awl 17 pressure-bearing, makes the material slowly fall into subordinate's equipment. During this embodiment installation, mounting flange 14 is located the below of discharge opening 13 to with the flange face bolt fastening of discharge opening 13 department, can set up sealed pad between the contact surface between the two and prevent leaking the powder, when carrying out the transport of lighter material, the material is easy to be taken at decompression awl 17 department and is encircleed, then can demolish decompression awl 17 this moment.

In a preferred embodiment, the mounting flange 14 is fixedly connected to the pressure reducing cone 17 by a plurality of support plates 18, with gaps between adjacent support plates 18. At this time, the mounting flange 14 can be manufactured according to a flange standard, and only the support plates 18 need to be welded between the mounting flange 14 and the bottom of the pressure reducing cone 17, as shown in fig. 5, the mounting flange 14 is of a square structure and is the same as the discharge opening 13 in shape, four support plates 18 are arranged, the four support plates 18 are respectively connected with four sides of the mounting flange 14, the width of each support plate 18 is smaller, so that the probability of material accumulation on the support plates 18 can be reduced, the support plates 18 can be obliquely arranged and can also extend along the radial direction of the pressure reducing cone 17, the length of each support plate 18 is usually not too long, the material is mainly decelerated by the surface of the pressure reducing cone 17, and therefore the support plates 18 preferably extend along the radial direction of the pressure reducing cone 17, at this time, the support plates 18 do not occupy the space in the vertical direction of the pressure reducing cone 17, and the contact surface between the material and the pressure reducing cone 17 is increased as much as possible.

The invention greatly improves the weighing precision of the batching scale by the design of the discontinuous helical blade, the design of the primary and secondary helix, the design of the arch lapping at the bin bottom and the design of the digital weighing device 11, and the batching scale can realize the high precision requirement of 0.5 per mill.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", and the like, indicate orientations and positional relationships based on the orientations and positional relationships shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be considered as limiting the present invention.

Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "connected" and "connected" are to be interpreted broadly, e.g., as being fixed or detachable or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art. In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.

In this specification, the schematic representations of the terms are not necessarily referring to the same embodiment. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments.

In light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations will be apparent to those skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.

Claims (10)

1. An interrupted blade screw conveyor, characterized in that: the device comprises a shell (1), a screw (2) positioned in the shell (1) and a driving motor (3) for driving the screw (2) to rotate, wherein a feeding hole (4) and a discharging hole (5) are formed in the shell (1);

the periphery of screw rod (2) is equipped with transmission blade, transmission blade includes continuous helical blade (6) and discontinuous helical blade, discontinuous helical blade is the spiral arrangement by a plurality of short blades (7) of interval arrangement and forms, and discontinuous helical blade is located the place ahead of discharge gate (5).

2. The discontinuous blade screw conveyor of claim 1, wherein: one axial end of the screw rod (2) is suspended.

3. The discontinuous blade screw conveyor of claim 2, wherein: the discharge hole (5) is positioned at one end, close to the suspended end of the screw rod (2), of the shell (1).

4. The discontinuous blade screw conveyor of claim 1, wherein: the screw pitch of the continuous helical blade (6) close to the discharge hole (5) is gradually increased.

5. An interrupted blade screw conveyor according to any one of claims 1 to 4, wherein: still include with thick screw conveyer (8) that casing (1) is connected, the entry and the higher level equipment of thick screw conveyer (8) are connected, and thick screw conveyer (8) with feed inlet (4) are connected.

6. The discontinuous blade screw conveyor of claim 5, wherein: the coarse screw conveyor (8) is connected with the feed inlet (4) through an intermediate connecting pipe (9), and an outlet of the coarse screw conveyor (8) is connected with the discharge outlet (5).

7. A batching scale which is characterized in that: comprising a silo (10), a weighing device (11) and an interrupted blade screw conveyor (12) according to any one of claims 1 to 6, the weighing device (11) being adapted to measure the weight of the material in the silo (10), the interrupted blade screw conveyor (12) being connected to a discharge opening (13) of the silo (10).

8. The ingredient scale of claim 7, wherein: the weighing device (11) is a digital weighing sensor arranged outside the stock bin (10), and the digital weighing sensor and the discontinuous blade screw conveyor (12) are electrically connected with the PLC.

9. The ingredient scale of claim 7, wherein: still be provided with between discharge opening (13) and discontinuous blade screw conveyer (12) and break and encircle device (16), break and encircle device (16) including awl fill (1601), break and encircle oar (1602) and drive break the actuating mechanism (1603) that oar (1602) is rotatory, the axial both ends of awl fill (1601) connect respectively discharge opening (13) with discontinuous blade screw conveyer (12), break and encircle oar (1602) and arrange along the horizontal direction, break and encircle oar (1602) and go up a plurality of radial extensions and along axial staggered arrangement's paddle (16021).

10. The ingredient scale of claim 7, wherein: the inside decompression awl (17) that still is equipped with of feed bin (10), the bottom of decompression awl (17) is equipped with can dismantle mounting flange (14) of being connected with discharge opening (13).

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